4-Amino-5-Hydroxy-2,7-Naphthalenedisulfonic Acid (H Acid)
4-Amino-5-Hydroxy-2,7-Naphthalenedisulfonic Acid, commonly known as H Acid, is a key dye intermediate with an amino-naphthalene core structure. Despite having hydroxy and sulfonic acid groups, the amine function is the principal characteristic, placing it under tariff item 2921.45.00 as a naphthylamine derivative. It is widely used in reactive and direct dyes for cotton.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the hydroxy group is considered the principal function
Amino-naphthol compounds with a dominant oxygen function may be classified under amino-naphthol-sulfonic acids.
If the product is put up as a synthetic organic colouring matter
Dye intermediates that are themselves colouring matters may fall under synthetic organic colouring matter.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the product is a separate chemically defined compound and not a mixture, as mixtures may be classified elsewhere
• Provide a detailed technical data sheet to CBSA to support the classification
• Verify if the product is subject to any export controls or environmental regulations in Canada
Related Products under Tariff item 2921.45.00
1-Naphthylamine-4,8-disulfonic Acid
1-Naphthylamine-4,8-disulfonic acid is a disulfonic acid derivative of 1-naphthylamine, used as a dye intermediate in textile and leather applications. It retains the primary amine function and is classified under the tariff item for naphthylamine derivatives. The presence of two sulfonic acid groups does not change its classification as an aromatic monoamine derivative.
1-Naphthylamine-4,8-disulfonic Acid (C Acid)
C Acid, or 1-naphthylamine-4,8-disulfonic acid, is a disulfonated derivative of 1-naphthylamine used in azo dye synthesis for textiles and leather. It is a chemically defined aromatic monoamine, classified under the tariff item for naphthylamine derivatives. The amine function is the principal characteristic, aligning with heading 29.21.
1-Naphthylamine-4,8-disulfonic Acid (Casella's Acid)
1-Naphthylamine-4,8-disulfonic acid, also known as Casella's acid, is a naphthylamine derivative with two sulfonic acid groups, used primarily as an intermediate in the synthesis of direct dyes. It retains the primary amine function characteristic of heading 29.21, and its sulfonic acid substituents do not alter its classification as an aromatic monoamine derivative. This tariff item covers 1-naphthylamine, 2-naphthylamine, and their derivatives, including salts thereof.
1-Naphthylamine-5-sulfonic Acid (Laurent's Acid)
Laurent's acid, or 1-naphthylamine-5-sulfonic acid, is a monosulfonated derivative of 1-naphthylamine, used in the manufacturing of acid dyes for wool and silk. It is a chemically defined aromatic monoamine, classified under the tariff item for naphthylamine derivatives. The amine function is the principal characteristic, aligning with heading 29.21.
1-Naphthylamine-8-sulfonic Acid (Peri Acid)
Peri acid, or 1-naphthylamine-8-sulfonic acid, is a derivative of 1-naphthylamine used in azo pigment synthesis for inks and coatings. It is a chemically defined aromatic monoamine with a sulfonic acid group, classified under the tariff item for naphthylamine derivatives. The primary amine function determines its classification in heading 29.21.
1-(Phenylamino)naphthalin-8-sulfonic Acid
1-(Phenylamino)naphthalin-8-sulfonic acid is an N-phenyl substituted derivative of peri acid, used in acid dye manufacture. It retains the naphthylamine structure and is classified under the tariff item for naphthylamine derivatives. The N-phenyl substitution does not remove it from the scope of aromatic monoamine derivatives.